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Physical quantities & units
Kinematics
Forces
Momentum
100

What is the SI unit for temperature?

Kelvin, K

100

The rate of change of velocity is known as ______________

acceleration

100

How many laws of motion are there?

Three
100

Define momentum.

Momentum is the product of mass and velocity of an object.

200

How many SI units are there?

Bonus (50 points each): Name the SI units



Seven

metre, second, mole, Kelvin, ampere, kilogram, candela

200

Name three kinematic quantities that are vectors.

displacement, velocity, acceleration

200

"A body at rest remains at rest and a body in motion remains in a state of motion at constant speed in a straight line, unless acted upon by an external force."

Which of Newton's Laws of Motion is this?

Newton's Second Law of Motion

200

Define the Principle of Conservation of Momentum.

The total momentum of a closed system is constant.
300

Convert 70 km/h to m/s

19.4 m/s

300

A car traveling at 15 m/s increases its speed at a constant rate until it reaches 40 m/s over a time period of 5 s.  What is its acceleration?

5 m/s2

300

What is the mathematical representation of Newton's Second Law?

Fnet = m a

300

Two vehicles are cruising down the expressway:

A lorry of mass 1000 kg travelling at 20 km/h

A motorcycle of mass 200 kg travelling at 100 km/h.

(a) Which has a greater momentum?

(b) Which has a greater inertia?

(a) Neither - they have equal momentum.

(b) The lorry has a greater inertia.

400

What is the precision of a micrometer screw gauge?

0.01 mm


400

An object travels at constant speed of 12 m/s for 20 s.  It then decelerates at a constant rate till it comes to a stop over another 4 s.  How far does it travel over 24 s.

264 m

400
A car of mass 1000 kg cruises down the expressway at 90 km/h.  What is the net force acting on it?

0 N

400
A billard ball of mass 0.5 kg travels at 10 m/s and hits a stationary ball also of mass 0.5kg.

After the collision, they stick together.  At what speed they move?

5 m/s

500

Newton's Second Law states: Fnet = ma

Using this equation, express the unit "Newton" in terms of SI base units.

kg m / s2

500

An object accelerates uniformly from 50 m/s to a speed of v at a rate of 2 m/s2 over 20 s, then continues at a constant speed for another 10 s.  It travels a total of 2.3 km. Calculate v.

90 m/s

500
A car of mass 800 kg is moving along a horizontal road. The forward engine force on a car is 2000 N and the friction acting against it is 350 N.

Calculate the acceleration of the car.

2.0625 m/s2

500

An object of mass 8 kg travelling to the right at 20 m/s collides with another object of mass 10 kg which is initially at rest.

After the collision, the 8 kg mass moves in the opposite direction at a speed of 10 m/s.  What is the speed of the 10 kg mass?

24 m/s